640260097 has 2 divisors, whose sum is σ = 640260098. Its totient is φ = 640260096.

The previous prime is 640260041. The next prime is 640260113. The reversal of 640260097 is 790062046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 590684416 + 49575681 = 24304^2 + 7041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640260097 is a prime.

It is equal to p_33313399 and since 640260097 and 33313399 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (640260007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320130048 + 320130049.

It is an arithmetic number, because the mean of its divisors is an integer number (320130049).

Almost surely, 2^640260097 is an apocalyptic number.

It is an amenable number.

640260097 is a deficient number, since it is larger than the sum of its proper divisors (1).

640260097 is an equidigital number, since it uses as much as digits as its factorization.

640260097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 640260097 is about 25303.3613774929. The cubic root of 640260097 is about 861.8906022848.

The spelling of 640260097 in words is "six hundred forty million, two hundred sixty thousand, ninety-seven".